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List of Warnings, Cautions and Notes

Harness modifications MUST BE SOLDERED PROPERLY. Use heatshrink tubing on the soldered joint to minimise the possibility of corrosion by the resin. See Page 15
1975 through '80 HEI distributors with an external vacuum advance unit WILL NOT WORK in conjunction with a TPI system. See Page 29
Any distributor used on the '87 and later roller lifter-type camshaft equipped engines must Use a distributor gear designed to be compat- ible with the billet steel camshaft used in these engines. See Page 29
If the fuel tank in your vehicle does not have provision for a return line, it is NOT necessary to modify the tank! See Page 34
1990 - 1992 TPI engines use a 4-pulse VSS. The 1985 - 1989 uses a 2-pulse VSS See Page 36
If you are using an electric engine cooling fan in your installation, it should also be wired to run whenever the AC compressor clutch is en- gaged! See Page 38
Be very careful when wiring the relays. See Page 40
88 and 89 Camaro and Firebird systems use Design 2 relays for the MAF power and MAF burn-off relays, and a Design 1 relay for the fuel pump application. See Page 41
Remove the ECM from the wiring loom connectors before doing any circuit testing or modifications, and be sure to solder all connections! See Page 41
DELETE if removing AIR pump and valve assembly. See Page 44
DELETE if not using evaporative emission canister. See Page 44
DELETE if removing EGR valve and control solenoid. See Page 45
DELETE if VSS is not used. See Page 48
DO NOT connect to common engine/chassis ground. See Page 48
If there IS a wire in this terminal, and a non-VATS MEM-CAL is not substituted, or if a VATS defeater is not added to the system, the en- gine WILL NOT START! See Page 50
Without some sort of cold start enrichment the engine will be VERY hard to start! See Page 50
DELETE if not using an air conditioning system. See Page 51
If you are using an electric engine cooling fan in your installation, it should also be wired to run whenever the AC compressor clutch is en- gaged. See Page 52
DELETE if not using an electric fan. See Page 52
DELETE if removing AIR valve and pump assembly. See Page 52
CAUTION
DO NOT, under ANY circumstances, apply +12V battery voltage across the IAC terminals! Doing so will permanently damage the mo- tor windings! See Page 53
DELETE If you are not using the ECM to control the TCC function or if you are using a transmission which does not incorporate a TCC. See Page 53
DELETE if not using the EGR valve. See Page 54
If you are using an electric engine cooling fan in your installation, it should also be wired to run whenever the AC compressor clutch is en- gaged. See Page 57
Because of the use of different intermediate plugs and harnesses be- tween the ECM and the ALDL connector on different make and year vehicles, the colour codes on the wires attached to the ALDL termi- nals will not always match the codes on the appropriate wires from the ECM. Double check the connections to ensure the proper circuits go to the proper terminals. See Page 62
ALWAYS BE SURE that the ignition key is turned off whenever you remove any fuse in this system! See Page 66
Be careful not to damage the gasket! See Page 83
Separating this connector will cause a Code 42 to be stored in in the memory of the ECM. The memory should be cleared after setting the timing by removing Fuse #l for 30 seconds after reconnecting the set- timing connector. See Page 84
If the TPS sensor was removed for any reason during the installation process it should be adjusted BEFORE starting the engine for the first time, and will then have to be READJUSTED AFTER the Minimum Idle Speed adjustment is made! See Page 86

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